Results: (1) Sloping and rotating directions of the fetal head were regarded as: the longitudinal lying and cephalic presentation, fetal head rupen and fetal neck extension.

• 用电动带锯按等距法制成与正中矢状面平行的腹、盆部连续矢状断层标本，并获取连续矢状断层标本图像数据，显示妊娠晚期宫内胎儿脑组织的形态结构。